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hexanpro2
hexanpro2
Associate
February 19, 2010
Question

USART STM32 asynchonous mode

  • February 19, 2010
  • 5 replies
  • 976 views
Posted on February 19, 2010 at 17:23

USART STM32 asynchonous mode

    This topic has been closed for replies.

    5 replies

    Andrew Neil
    Andrew Neil
    Super User
    May 17, 2011
    Posted on May 17, 2011 at 13:40

    It would be polite to acknowledge the help that you've already received on this:

    http://raisonance-forum.xsalto.com/viewtopic.php?id=3179

    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    Tesla DeLorean
    Tesla DeLorean
    Guru
    May 17, 2011
    Posted on May 17, 2011 at 13:40

    The USART Data Register (DR) is 16-bits wide, to accommodates all 9 bits (

    D0

    ..

    D8

    )

    You should always write the DR as an ''unsigned short'' or ''u16'', if using DMA the 9-bit mode would require you send Half Words, not Bytes.

    -Clive

    /*******************************************************************************

    * Function Name  : USART_SendData

    * Description    : Transmits single data through the USARTx peripheral.

    * Input          : - USARTx: Select the USART or the UART peripheral.

    *                    This parameter can be one of the following values:

    *                     - USART1, USART2, USART3, UART4 or UART5.

    *                  - Data: the data to transmit.

    * Output         : None

    * Return         : None

    *******************************************************************************/

    void USART_SendData(USART_TypeDef* USARTx, u16 Data)

    {

      /* Check the parameters */

      assert_param(IS_USART_ALL_PERIPH(USARTx));

      assert_param(IS_USART_DATA(Data));

      /* Transmit Data */

      USARTx->DR = (Data & (u16)0x01FF);

    }

    Tips, Buy me a coffee, or three.. PayPal Venmo (See Profile) Up vote any posts that you find helpful, it shows what's working..
    Andrew Neil
    Andrew Neil
    Super User
    May 17, 2011
    Posted on May 17, 2011 at 13:41

    There is an example of using the USART in Multiprocessor Mode (ie, 9-bit mode) included in the Standard Peripheral Library:

    Project\STM32F10x_StdPeriph_Examples\USART\MultiProcessor

    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
    hexanpro2
    hexanpro2Author
    Associate
    May 17, 2011
    Posted on May 17, 2011 at 13:41

    Thanks, for your anwser and your time...

    I base my communications in this base, and this saves me a lots af time...

    Thanks for your time, once more...

    My complements...

    Andrew Neil
    Andrew Neil
    Super User
    May 17, 2011
    Posted on May 17, 2011 at 13:41

    Have you read the description of the Multiprocessor Mode in the RM0008 Reference Manual?

    A complex system that works is invariably found to have evolved from a simple system that worked.A complex system designed from scratch never works and cannot be patched up to make it work.
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